The United States is putting renewed pressure on the Palestinian leader, Yasser Arafat, to stop attacks by militants, after a gunman went on the rampage in Jerusalem.

Two women, who were among the more than 20 people injured in Tuesday's attack, have now died of their wounds in hospital and two other people are said to be in a serious condition.

There's no justification for these kinds of attack

Richard BoucherState Department spokesman

The al-Aqsa Martyrs' Brigade, a group linked to Mr Arafat's Fatah faction, said the gunman, who opened fire with an automatic weapon in west Jerusalem, belonged to its organisation.

A State Department spokesman in Washington said the US was once again calling on Mr Arafat to take immediate and effective steps to end the attacks and bring those responsible to justice.

"There's no justification for these kinds of attacks. They only kill innocent people," spokesman Richard Boucher said.

The shooting happened in Jaffa Street, near a popular shopping mall which was the scene of a suicide bombing in December 2001.

Police say the gunman fired on people at a bus stop and other passers-by for about 10 minutes before being shot dead.

The streets of the city were crowded with people returning home from work.

Jerusalem police chief Mickey Levy said: "The terrorist tried to run away, but after a short
chase, police succeeded in hitting him and killed him."

The Israeli Government has blamed the Palestinian Authority for the attack.

"We hold responsible the terrorist organisations Islamic Jihad, Hamas and the Tanzim, which commit in turns these atrocities, and
the Palestinian Authority which does nothing to stop them," said spokesman Avi Pazner.

Some of the injured are seriously ill in hospital

The latest attack was "a continuation of the terrorist
campaign against Israeli civilians, women and children, committed by terrorist organisations with the passive or active encouragement of the Palestinian Authority", he added.

The shooting occurred shortly after the militant Islamic group Hamas declared that it would be waging all-out war on Israel.

The group issued its statement following an incursion by Israeli forces into the Palestinian-run West Bank city of Nablus, in which four Hamas members were killed.

"This massacre opens the door wide open for a fierce war, which will reach the Zionist gangs everywhere, and with all means," it said.

After the Israeli raid on Nablus, thousands of demonstrators surrounded a Palestinian police station in the town and forced the release of a militant - the brother of one of those killed in the raid.